Safety appliance for hot-blast stoves.



J. A. DYBLIE.

SAFETYAPPLIANGE FOR HOT BLAST STOVES.

APPLICATION FILED M1144, 1911.

1,064,061, Patented June 10, 1913.

3 SHEETS-SHBBT 1.

MIXER PIPE alf) J. A. DYBLIE.

SAFETY APPLMNUE FOR HOT BLAST sTovBs.

APPLICATION FILED APB.14.1E)11.

Patented June 10, 1913.

3 SHEETS-SHEET 2.

lizzie/fafa ff. KZ 7 @Ma LUpOl.

J. A. DYBLIE.

SAFETY APPLIANGE FOR HOT BLAST sTovBs.

Patented June 10, 1913.

3 SHEETSWSIIBE'F 3.

APPLlOATION PILBUAPR.14,1911,

Y the ey by a set screw 67. Tothe back of the valvev relatively small, restricted port -f-lfG opening, into the cylinder and the valve casino; is provided with large ports 47 opening into theehamber 87. rllhc valve stein is preterably provided with guide wings 4t2 that fit within the reduced inner end of the casingBQ.

A by-pass pipe i8 is threaded into the outer eind of the valve easing' 3) and is suitably eonnectedwith the cold blast pipe 12 and preferably through the medium of a mixer pipe), to which the low-er end of the pipe 118 is attached. (See Figs. 1 and 2.) In the by-pass pi pe 4S is placed the casing. 50 of a` three-way yalve, this casing having a vent nozzle 51.: The three-way 'valve within thercasinel 50 may' be oit' ordinary construction and` to its stem is attached alever 52, one end of which carries a weight while the. oppositevend has connected thereto a cable or cord 54, whereI-)y the shitting of the valve may be readily ettectedi` The weight 53 normally holds the tlfireefway valve in such position that communication is established between the mixer pipe 4.9 andfthe upper end of the cylinder 32, sothat compressed air will llow through theby' pipe 48 into the upper end of By pulling the cord or cable way valve is shifted to eut oit' 54, tliegA, theflow o i-8 and establish communication between the upper end of the cylinder 32 and the. atmosphere.

.The mixer pipe 4f) leads from the cold blast pipe Y12 to the hot blast pipe 1G and in the mixer pipe is placed a casing wherein is contained acheck valve 55 and preterablv, also, the controlling' valve 5G. The easing formed, shown more particularly in Figs. 5 and 6 of the drawings, of two lsections 57 and 58 having' inclined abutting lianges secured together by bolts 59, the'youterends of the easingV sections and the portions of the mixer pipe having abuttingr flanges connected by bolts (t0. The inner end of the casing section v58 is provided with an inclined seat G1 for the valve f l This valve comprises a plate pivotally con- `iiected to. arms G2 upon its back, 'these arms being lhstened4 atv their `upper ends to a shaft (33 that ,extends through the walls ot lthe easing' section 57. One end of: the shaft (S'preterablv extends through a stalling;- box 641- and, outside the casing, has lixed thereto an arm G5 which extends in opposite direction trom the arms 62 and whereon a counterbalancing weight (36 1s ad Justably secured 55 ispivotally 'connected the lower end ot a link (38, the opposite end ol which link' is pivotally secured by a pin V6) to the yol eshaped end ot a bolt that is secured to aipistoi 7l. v a cylinder 72, thefianged lowerend of lompressed air through the pipe` '.lhe piston 71 is arranged in' .delirered to the. blast furnace.

which is bolted to a ring or plate 73 that is fastened to the upper face of the valve casine' section 57'over an openingtherein. rlhe head 7lat the outer end of the cylinder v72 proifi-tlerl'n'itli a'vent port 75. rthe faire 5G is preferably of the hutten ily type and is mounted ou a shaft 7G that is j ournalfged in the side walls ,of the casing section :i8 (sce Fig'. One end of the shatt Tt? extends through a stalling box 77 at one side ot the casing'and an operating v het blast pipe 1G and thereby regulate the temperature ot the compressed air that is rEhe valve 56 is provided with a stop lug S1 which is arranged to engage the wall of the casing section when the valve 56 is in Wide open posit-ion.

Then the stove is in operation cold compressed air is admitted through the pipe 11 to the bottom of the stove 10 and air under pressure tiows from the supplyl pipe 12 .through the mixer and by-pass pipes 4-9 and atb to the upper end of the controlling cylluder The ,pressure of the air unseat's the cheek valve 41 so that compressed air passes into the upper end of the cylinder` and forces the piston down. The downward movement .of the piston, throughthe medium of the cable 2G, lifts the valve 2l from the position shown in 'full lines to that shownby dotted lines in Fig. 2 of the drawings. As the piston 33 is thus forced downward, air escapes freelyfrom the lower portion of the controllingh cylinder-32 through the vent ports 35 and 36 adjacent the -lower end thereof. As the piston approaches the lower end of the cylinder, it closes the lar er vent port 35 and the lower end of the ey inder then acts asA a dash-pot to check the too lrapid movement of the-pist(` n and of the valve 21 controlled thereby. The smaller vent `port 36 then allows the slow escape of air from the lower end of the cylinder 32 until the valve 21 has been completely raised to its open position shown by dotted lines in Fig'. 2.` So long as air under pressure 'is thus maintained in theupper end of the controlling cylinder 32, the valve 2l is held in open position, so that the heated air y'passes from the stove -10 through the pipe ,14 and valve easing 15 to the'hot blast pipe 16, whence it is delivered to the'furnace.

It, however, from any cause the pressure of' air in the cold blast pipe is out off ordereduced to such degree that there'inay be danger ot a hack-flow of gas from the furnace through the hot blast pipe 16, the pres-v sure in the upper end of the cylinder 82 is reduced and thel weight of the" valve 21 and Cil tor controlled by the pressure ci the air blast for actuating said valve, and means for controlling said motor to eiiect the opening and closing et said valve at will.

3. inl combination, a hot blast main, a hot blast stove having a discharge pipe opening into said main, a self closing, safety check valve in said discharge pipe between said stove and said main, a lluid pressure device controlled by the compressed air of the blast for opening and holding open said valve, andl means for controlling said motor to effect the opening and closing of the valve at Will.

fl. ln combination, a hot blast stove, a discharge pipe for the hot blast, a self-closing, safety check-valve in said discharge pipe, a liuid pressure device controlled by the compressed air ont the blast for ojjiening and holding open said. safety valve, and a manually operable valve 'tor controlling the admission and exhaust of compressed air to and from said iluid pressure device to control the opening and closing of the valve at will.

5. ln combination, a het blast stove, a diss charge pipe tor the hot` blast, a safety cutoit' valve for said discharge pipe arranged above and on the discharge side of its seat and vertically movable to and from its seat, a motor cylinder and piston for shifting said cut-oit valve, a pipe for conducting the compressed air of the blast to one end of said cylinder and valve mechanism for cutting ol' the supply through said pipe and connecting said'cylinder to the atmosphere.

G. ln combination, a hot blast stove, a discharge pipe for thehot blast, a safety cut-oil' valve l'or said discharge pipe arranged above and on the discharge side of its scat. and vertically movable to and from its seat, a motor cylinderand piston for shifting said cutotl' valve, a pipe for conducting the compressed air of the blast to one end of the cylinder, and a manually operable valve ttor controlling the admission and exhaust of air to and from said cylinder.

'l'. ln coinl'iination, a hot blast stove, a discharge pipe :tor the hot blast, a safety cut-olt valve for said discharge pipe arranged above and on the discharge side of its seat and vertically movable to and from its seat, a motor cylinder and piston ior shifting said cut-oil valve, said cylinder. having a pluralityof vports at 'different distances from its opposite ends, and a pipe communicating with vthe ports at one end of said. cylinder for supplying the compressed air of the blast thereto.

= 8. In combination, a het blast stove, a discharge pipe for the hotblast,a safety cutoii" valve rfor said discharge pipe arranged above and on the idischarge side ct its seat and vertically movable to and from its seat, a motor cylinder` and piston for shifting said cut-oil' valve, said cylinder having two vent ports at different distances from one end, and two inlet and exhaust ports at different distances. from its opposite end, an inwardly opening check lvalve controlling the outer inlet and exhaust port, said check valve having a restricted opening therethrough, and a pipe communicating with said inlet and exhaust ports for supplying the compressed air of the blast thereto.

9. lncombination, a hot blast stove, a delivery pipe for the hot blast, a vertically .movable cut-od' valve infsaid delivery pipe arranged on the discharge side of its seat, a controlling cylinder, a piston in said cylindex', a cable connecting the rod ot' said piston and the stem of said valve, a pulley over which said piston extends, a supply pipe connected to said inlet pipe for comflucting the compressed air of the blast to the upper end of the cylinder, and a manually operable valve for cutting oil the supply ol compressed air and for connecting the upper end of said cylinder to the atmosphere.

l0. In combination, a hot blast stove, a delivery pipe for the hot blast, a 'vertically movable cut-oilA valve in said delivery pipe arranged on the discharge side of its seat, a controlling cylinder, a piston in. said cylinder, connected to lsaid cut-oit' valve, a mixer pipe connecting said inlet and delivery pipes, a supply pipe connected to said mixer pipe and to one end ol said cylinder and n'ianually operable,controlling valves in said mixer and said supply pipes.

ll. ln combination, a hot blast stove having. a pipe for admitting cold compressed y air thereto and a pipe for discharging the heated air therefrom, a mixer pipe extending between the cold blast pipe and the hot blastpipe, a valve casing lin said mixer pipe, a safety check-valve in said casing and a fluid pressure device exposed on opposite sides to theat-md'l here andto the pressure in said mixer pip` for controlling said valve.

l2.` ln combination, a hot blast stove having a pipe for admittingcold compressed air thereto and a pipe'for discharging the heated air therefrom, a mixer pipe extending between the cold blast pipe and the hot blast pipe, a valve casing in said mixer pipe, a safety check-valve in said casing opening in the direction ofl the normal'fiow through `said mixer pipe and a motor cylinder and piston connected to said check valve, one. end of said cylinder being in communica-I tion ivith the said mixer pipe on the deliv ery side ot said check-valve.

13. In combination, a hot blast4 stove having a pipe for admitting cold compressed air thereto and a pipe 'for discharging the heated air therefrom, a mixer -pipe extending between the cold blast pipe and the-hot blast pipe, a valve casing in said mixer pipe,

an inclined check valve-in said casing piv- 35 inlet pipe directly iaith slaid discharge with on the discharge side ot' said checkvalve, a p'itston in said cylinder, and a link connecting said piston to said cheek valve.

14. In combination, a hoty blast stove having,` a pipe for admittinge/old compressed it) air thereto and a pipe fo'rftlischarging the heated air there'trom, a mixer pipe connecting` the cold blast pipe and the hot blast pipe,f a soliti-closing, safety cheek valve in said -iilixer pipe/opening in the direction ot the nidi-mal tloiv therethrough, and a ytiuid pressiire device exposed on one side to the pressurei` in said mixer pipe for holding said satetyy ellecl': valve open.

15)' lp cojinbination` a"hot blast stove hav#y .I ii/i V 2O ing :ii-pipe for admittingl eold compressed air thereto and a pipe ,for discharging the heated aiiyytherctroni, a mixer pipe extending between the coldfblast pipe and the hot;

blast pipe, a manually `operable valve in said i' inixer pipe Yfor reglulating the llou' therethrough, ai self-cloning, ysat'ety checl; valve in said niixei'ypipe opening in the direction ot the norn'uvl t'loiv,therethrough, and nieztns controlled by the tlow ot' air through said mixer piljie/for holding said sat'ety cheek valve open.' f

16. In eon'ibination, a h'ot blast stove having .inlet and discharge yiiiripes tor the compressed air, a mixer pipe connecting said eine, self closing, sa'letyl/checi( valves in said discharge pipe and in said mixer pipe, and .means controlled by the pressure olf the air blast, for holding Said sa't'ety check valves 40 kopen.

17. In coinliination, a hot blast stove hav ing inlet and discharge pipes for the coinressed `airria mixer pipe directly connecting lsl'id inlet. and said discharge iiipea, seit clos-ingr safety check valves in said discharge lpipe and ,in said mixer pipe, and fluid preay"faire devices controlled by the pressure ot the nii' blast for holding said safety checlc valves open, and manually operable means for rutting ott' the flow of air to said discharge pipe and said mixer pipe.

`18. .ln combination, a hot. blast stove, a 'discharge pipe for the hot blast', a safety check valve in said discharge pipe, a thiid pressure device for opening and holding open said valve, a pipe `tor conducting coinpressed air ol' the blast to said cylinder, and valve mechanism norniallvheld in position to open eoinmiinication through said pipe, said valve being manually shi'ttable to eut oli' eoinniunication through said pipe and connect said cylinder to an exhaust port, whereb)Y the closing ot said valve may be controlled at will.

lt). In Safety appliances ilor blast tui'- naces. the combination ivith a hot blast stove and discharge pipe leading there'troin, a saiety cheri: valve in said discharge pipe for preventing the bark tlow otI t'urnare gases therethrough and a [luid pressure device controlling said safely check valve.

20. ln combination` a het blaat stove, a discharge pipe lor the hot blast leading troni said lstove` a aat'ety cheek valve `tor 'said discharge pipe between the stove and the `furnace and arranged to close autoniaticallv aiul prevent bach llou' and escape ol gas'es Yl'roin the turn-ice. and means eontiolled hiv the pressure ol the blast for opening and holding open said valve.

Qt. lu coinbiiiatioin a hot blast stove, a discharge pipe `for the hot blast. a sellV clos ing, sal'etv check valve Al'oi said discharge pipe, and a fluid pressure device controlled by the pressure ol" the blast 'l'or holding said valve open. n

lin eoniliination. a hot blast lstove. a discharge pjpe l'or tht` hot blaat. a safety check valve' tor said discharge pipe, a lluid pressure device l'oi' opening said valve and means for controlling .said luid pressure devire to etl'ect the opening and closing o't said valve at will.

W i t nesses Illia-:axon llaoi-zuow, AKvriiaiuixic (liciuaxoii 

